Set of two 100mm inside diameter cast-aluminum telescope tube rings with quick-release, hinged clamp knobs and felt lining
One ring has 1/4″-20 piggyback camera adapter; the other tube ring has a threaded 1/4″-20 hole
Sold in sets of two telescope tube rings with mounting bolts included
Use with any Orion equatorial or altazimuth telescope mount – use with some mounts may require a tube ring mounting plate (sold separately)
Inside diameter of each tube ring is 100mm – works with telescope optical tubes up to 100mm in diameter

Set of two cast-aluminum telescope tube rings with quick-release, hinged clamp knobs and felt lining
One telescope ring has 1/4″-20 piggyback camera adapter; the other has threaded 1/4″-20 acceptor socket
Sold in sets of two rings with mounting bolts and washers included
Use with Orion EQ-1, EQ-2, AstroView, SkyView Pro, Sirius, or Atlas equatorial mounts and SkyView AZ, VersaGo II, and Teletrack altazimuth telescope mounts
Inside diameter of each telescope tube ring is 116mm

Set of two cast-aluminum telescope tube rings with quick-release, hinged clamp knobs and felt lining
Tube rings allow you to securely attach a telescope optical tube to a mount and tripod
Sold in sets of two rings with mounting bolts and washers are included
One telescope tube ring has 1/4″-20 piggyback camera adapter; the other has a threaded 1/4″-20 socket
Inside tube ring diameter is 76mm

Set of two cast aluminum telescope tube rings with quick-release, hinged clamp knobs and felt lining
One tube ring has 1/4″-20 piggyback camera adapter post; the other has threaded 1/4″-20 socket
Set of two telescope tube rings with mounting bolts and washers included
Use with Orion EQ-1, EQ-2, EQ-3, or AZ-3 telescope mounts
Inside ring diameter is 90mm